Can You help me I want to lean about high frequency transformers in psu, but I was unable to find the datasheets with the windings. this is my psu. thank tou in advance.
The transformers are tm8350-erl35, 8350 ee16dx, 8350ee19dx.
I want to undertand how to find specifications and datasheet of high frequency power transformers to test the windings.
Some book or datasheets are welcome. Thank you again

 

Those are very likely to be custom transformers and inductors. Is there the name of the manufacturer printed on them anywhere?

 

Custom ones. Buy an Inductance meter first.

 

Custom ones. Buy an Inductance meter first.

The inductance is likely to be pretty low and some commercial meters struggle that low.

An inductance bridge might be needed - then we're talking laboratory grade instruments at laboratory grade prices.

For all intents and purposes, a shorted turn tester might be nearer the mark.

The Australian Dick Smith Electronics did such an instrument for testing TV flyback transformers - but even that shows a short on very low inductance.

The kit probably isn't available anymore, but the schematic is floating about in various places online.

 

The inductance is likely to be pretty low and some commercial meters struggle that low.
An inductance bridge might be needed - then we're talking laboratory grade instruments at laboratory grade prices.
For all intents and purposes, a shorted turn tester might be nearer the mark.
The Australian Dick Smith Electronics did such an instrument for testing TV flyback transformers - but even that shows a short on very low inductance.
The kit probably isn't available anymore, but the schematic is floating about in various places online.

I picked up a cheap Chinese RC meter off ebay for $15.00 I checked it and it is quite accurate, and a wide/dual range.
I built one of the Dick Smith HOT testers eons ago from his print, but it shows go/no go, no actual value displayed.
Max.

 

Pulse Engineering was my usual first choice when looking for transformers.
http://www.pulseelectronics.com/
The logo is the same, but it seems they've changed their name. I hope it is actually the same company that I remember.

 

I picked up a cheap Chinese RC meter off ebay for $15.00 I checked it and it is quite accurate, and a wide/dual range.
I built one of the Dick Smith HOT testers eons ago from his print, but it shows go/no go, no actual value displayed.
Max.

The one I bought pings the inductor with an oscillator built round a comparator.

The ringing pulses are clocked through a SIPO shift register - the more times it rings, the more LEDs light up.

 

Pulse Engineering was my usual first choice when looking for transformers.
.

Digikey carry a wide range of Pulse Electronics components.
Max.

 

The one I bought pings the inductor with an oscillator built round a comparator.

The ringing pulses are clocked through a SIPO shift register - the more times it rings, the more LEDs light up.

Correct, same as the version I built.
Max.

 

Here is my old copy.
Max.

 

Those are very likely to be custom transformers and inductors. Is there the name of the manufacturer printed on them anywhere?

No, there is no mark. thank you

 

Those are very likely to be custom transformers and inductors. Is there the name of the manufacturer printed on them anywhere?

May be I don't know how to test the primary side (4 pins) and the secundary side(2 pins or more). This is the problem. I found in another PSU the primary side 4 pins (2 primary ) and 2 pins in the secundary part. It was easy, because one of the primary side was broke. So the psu never work and the windings are very hard to fix.
In this case I found 4 or more pins in primary side and 3 or more pins in the secundary side. I only want to test continuity to be sure the problem is another one.

For example i looking something like this to be sure the windings are not open.